Metal door



June 16, 1931.

N. 'MICHELMAN METAL DOOR Filed Dec. 24. 1927 Fig.3.

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ATTORNEYS taken along the line H Patented June 16,1931

NATI-IAN 'MICI-IELMAN, or .BRQOKLYN, NEW YORK METAL noon Application filed December 24, 1927. SerialNo. 242,414;

This invention relates essentially to a metal door or similar article having a front and back which is constructed of two sections of steel or similar analogous metal plate shapedto simulate each other, and it com prehends devices for locking the two sections together in spaced relation to each other.

An objectof the invention is to shape each sectionby formingthe stiles, rails, molding and panel integral thereby producing the front or'back unit withits sunken panels merely by shrinking and applying pressure to a steelplate;

Another object of the invention is .to securely fasten the front and back walls together after the units are completely shaped, by'means of a metal key arranged to extend from the top to the bottom in the space adjacent the sides of the two units. Another object of the invention is to .provide a key keeper welded to the, innerside portion of each sectionbefore the sections are positionedtogether, so that in orderto interlock the sections rigidly together it will: only be necessary to drive the key into a groove formed by the keeper members.

Another objectof the invention is to prov vide reenforcing devices welded to eachwall of a unit and associated with a metal bar whereby the front and rear panels which are surrounded by a contiguous moldingare pre vented from buckling.

The inventionresides more particularly in the novel combinations hereinafter described 3 and claimed, reference being made to the accompanying drawings in which:--

Fig. 1 represents a front elevati'onof a door embodying this invention. I a

F ig.'2 is a side or edge view of the same.

Fig. 3 is a. vertical longitudinal section takenalong the line 3-3 of Fig. 2. r

Fig. 4 is a horizontal. transverse section of Fig. 1 on a larger scale.

Fig. 5 is a perspective view of a keeper unit;

In, the drawings the numeral 6 designates a panel, 7 is the molding, 8 is the stiles and 9 is the rails of a door unit formed from a sin gle sheet of steeland stamped to the shape shown. Eachside 10 is integral vwith. the

. groove extending top and bottom units together.

stiles andis bent and rear walls. The other unit-is a counter: part of the unit noted above and is adapted to be placed onto the first unit withthe edges of the sidewalls in contact and the surfaces flush with each other. a

The means for locking the two units together. 'consists'of keepermembers as indi+- cated in Fig. 5, each having a wall 11 whereby thegmember is spot weldedto the inner-sun" face adjacent the stile of a unit. I One wall 11 isthus fastened to one of the unitsand the wall of the other keeper is secured in a similar way to thesecond unit. When the two units are positioned together 'the two keeper. members arebrought into register or alignment by. tongues l2engaging;.openings or slots 1310- cated in the edgeofthe guide keepers and alternating with edge of the slot impinges on a shoulder 14 solas tolimit th member relative the other. each memberis bent inwardly as shown at 15 so to forma substantially rectangular from the top to the bottom of the unit. r

A "metal key 16 is forced into the groove and through holesrespectively located in the of "channel plates 17.;while the-ends thereof canpbe' brazed to the front and back plates thereby preventing displacement. There are two of the keys shown in Figs. 3 and, 4 one for eachside and theyeffectively in conjunction with the keepers form invisible fasteners to hold the two door he channeled plates 17 permit the upper or lower edge of the rail to be filed or ground without fracturing the sure face of the metal when the door is installed and they form a The two door units when joined together form the front and backof the door with a a space therebetween inwhich can be packed a sheet 18"ofnoneheat conducting material such as asbestos.

A device for obviating warping or buckling of the panels of each unit includes, a metal bar 19 inserted. in a hole centrally located in the top and bottom" channeled plates. The bar coacts with metal strap members each reenforcement for the walls.

at right angles to the front the 'tongues. The inner ree. lateral movement of one The tongue of 7 having a support or base 20 whereby the member is spot welded to its respective panel. When in place the bar extends from the top to the bottom of the channel so as to stiffen the panels.

I claim 1. A metal door comprising front and back wall sections each section shaped with integral stiles and rails from a single sheet of steel, each section having a pair of inte ral side members which abut against the e ges of the adjacenteside members to create an air space between the walls of the sections with a packing material arranged therebetween, a top and bottom channel plate secured to the sections and a plurality of holes located in the plates, pairs of interlocking keepers welded 'to the inner portion of the sections adjacent the abutting edges, and a key passing through each hole made to engage the keepers so as to'lock the sections together. I

, 2. A metal door comprising front and back wall sections each section shaped with integral stiles, railsland panels from a single sheet of steel, each section having a pair of integral side memberswhich abut against the edges ofthe adjacent side members to create an air space between the walls of the sections with a packing material arranged therebetween, a top and bottom channel plate welded to the sections and a plurality of holes located in the plates, pairs of interlocking keep ers welded to the inner portions of the sec tions adjacent the abutting edges, a key passing through each hole made to engage the keepers so as to lock the sections together, strapswelded to each of the sections behind the panel, and abar inserted inv one of the holes in the upper channel member and passing through a hole in the lower channel member made to engage the straps.

In testimony whereof I have hereunto set my hand. NATHAN MICHELMAN. 

